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CN-121975395-A - Corrosion-resistant fluorocarbon coating material and preparation method and application thereof

CN121975395ACN 121975395 ACN121975395 ACN 121975395ACN-121975395-A

Abstract

The invention discloses an anti-corrosion fluorocarbon coating material, a preparation method and application thereof, and relates to the technical field of coating materials. The coating material is formed by three layers of sequentially coated structures, a chemical bonding gradient interface is formed between the layers through in-situ reaction of a silane coupling agent, the primer contains polyaniline/graphene composite and zinc powder to realize cathodic protection, the intermediate paint contains furan modified epoxy and alloy micro powder to form the chemical bonding gradient interface, and the finish paint contains silicon carbide whiskers and silicon dioxide microspheres, so that the coating material is wear-resistant and super-hydrophobic. According to the material, the problems that the existing photovoltaic bracket coating cannot monitor the corrosion state and fluorocarbon finish paint is easy to wear and lose efficacy in a sand-blown environment are solved, and sand-blown corrosion can be effectively resisted.

Inventors

  • WANG RUONAN
  • HU FEIYAN
  • XU CHAOHUA
  • WU CHAO

Assignees

  • 江门职业技术学院

Dates

Publication Date
20260505
Application Date
20260302

Claims (10)

  1. 1. A corrosion resistant fluorocarbon coating material comprising, sequentially applied to a surface of a metal substrate: A first primer layer comprising an epoxy resin, a polyamide curing agent, a polyaniline/graphene composite, a flaky zinc powder, a KH-560 silane coupling agent and a solvent; the second intermediate paint comprises furan modified epoxy resin, bismaleimide, an anhydride curing agent, sn-Bi low-melting-point alloy micro powder, an ionic liquid repairing agent, a KH-550 silane coupling agent and a solvent; the third layer of finish paint comprises FEVE fluorocarbon resin, HDI trimer curing agent, silicon carbide whisker, hierarchical silicon dioxide microsphere, fluorosilane surface modifier and solvent; Wherein the mass ratio of the epoxy resin to the furan modified epoxy resin to the FEVE fluorocarbon resin is 1 (1.50-1.80) (0.80-1.00).
  2. 2. The corrosion resistant fluorocarbon coating material of claim 1, wherein the components of the first primer layer are present in an amount of 100 parts by weight of epoxy resin: 100 parts of epoxy resin, 32-38 parts of polyamide curing agent, 6-10 parts of polyaniline/graphene composite, 20-30 parts of flaky zinc powder, 2.5-4.0 parts of KH-560 silane coupling agent and 30-45 parts of solvent.
  3. 3. The corrosion-resistant fluorocarbon coating material of claim 1, wherein polyaniline is modified on the surface of graphene in a chemical grafting manner in a polyaniline/graphene composite, and the mass ratio of graphene to polyaniline is 1:3-1:5.
  4. 4. The anti-corrosion fluorocarbon coating material as claimed in claim 1, wherein the second intermediate paint comprises 100 parts by weight of furan modified epoxy resin, 40-50 parts by weight of bismaleimide, 55-65 parts by weight of anhydride curing agent, 6-10 parts by weight of Sn-Bi low-melting-point alloy micro powder, 4-7 parts by weight of ionic liquid repairing agent, 3.5-5.0 parts by weight of KH-550 silane coupling agent and 45-60 parts by weight of solvent.
  5. 5. The corrosion-resistant fluorocarbon coating material as claimed in claim 1, wherein the furan group content in the furan-modified epoxy resin is 25-35mol%, the molar ratio of bismaleimide to furan group is 1.05-1.25:1, the melting point of the Sn-Bi low melting point alloy micro powder is 135-145 ℃, the particle size is 30-120 μm, and the ionic liquid repairing agent is 1-butyl-3-methylimidazolium tetrafluoroborate.
  6. 6. The anti-corrosion fluorocarbon coating material as claimed in claim 1, wherein the third layer of finish paint comprises 100 parts by weight of FEVE fluorocarbon resin, 42-48 parts by weight of HDI trimer curing agent, 6-10 parts by weight of silicon carbide whisker, 10-15 parts by weight of silicon dioxide microsphere, 1.5-2.5 parts by weight of fluorosilane surface modifier and 60-80 parts by weight of solvent; wherein, the silicon dioxide microsphere is prepared by chemical grafting modification of fluorosilane on the surface of micron-sized nuclear body with the grain diameter of 1.0-2.5 mu m, and the diameter of the silicon carbide whisker is 0.08-0.5 mu m and the length is 8-25 mu m.
  7. 7. The corrosion-resistant fluorocarbon coating material of claim 1, wherein the solvent of the first primer is a mixed solvent of xylene and n-butanol, the solvent of the second intermediate paint is a mixed solvent of butanone and propylene glycol methyl ether acetate, and the solvent of the third top paint is a mixed solvent of butyl acetate, propylene glycol methyl ether and xylene.
  8. 8. A method of preparing the corrosion resistant fluorocarbon coating material as set forth in any one of claims 1 to 7, comprising the steps of: (1) The substrate pretreatment, namely carrying out sand blasting and rust removal on the metal substrate of the photovoltaic bracket to Sa2.5 grade, and cleaning and drying the metal substrate with the roughness rz=40-70 mu m; (2) Coating a first primer, namely mixing a primer composition containing epoxy resin, polyaniline/graphene composite, flaky zinc powder and KH-560 silane coupling agent with a polyamide curing agent, adding a solvent to adjust viscosity, spraying on the surface of a substrate, and pre-curing at 55-70 ℃ for 25-35min to form a first coating with a dry film thickness of 58-72 mu m; (3) Coating a second intermediate paint, namely mixing an intermediate paint composition containing furan modified epoxy resin, bismaleimide, sn-Bi low-melting-point alloy micro powder, an ionic liquid repairing agent and KH-550 silane coupling agent with an anhydride curing agent within 4 hours after the pre-curing in the step (2), adding a solvent to adjust the viscosity, spraying the mixture on the surface of the first coating, curing the mixture for 25-35 minutes at a temperature of 75-85 ℃ through gradient heating, and then heating the mixture to 115-125 ℃ at a temperature of 1.5-2.5 ℃ per minute for 55-70 minutes to form a second coating with a dry film thickness of 78-92 mu m; (4) Coating a third layer of finish paint, namely mixing a finish paint composition containing FEVE fluorocarbon resin, silicon carbide whiskers, hierarchical structure silicon dioxide microspheres and a fluorosilane surface modifier with an HDI trimer curing agent, adding a solvent to adjust viscosity, spraying on the surface of a second coating, pre-curing the second coating by irradiation of 365nmUV light for 1.5-3.0min to obtain an energy density of 150-250mJ/cm 2 , and thermally curing the second coating at 75-85 ℃ for 25-40min to obtain a third coating with a dry film thickness of 28-38 mu m; (5) And (3) overall post-treatment, namely placing the coating system at room temperature for 5-10 days to complete curing, wherein the total dry film thickness is 170-205 mu m.
  9. 9. The method for preparing a corrosion resistant fluorocarbon coating material as claimed in claim 8, wherein the dry film contact angle of the third layer top coat is equal to or more than 155 ° and the rolling angle is equal to or less than 8 °.
  10. 10. Use of the corrosion resistant fluorocarbon coating material as claimed in any one of claims 1 to 7 for the surface of photovoltaic supports.

Description

Corrosion-resistant fluorocarbon coating material and preparation method and application thereof Technical Field The invention relates to the technical field of coating materials, in particular to an anti-corrosion fluorocarbon coating material, and a preparation method and application thereof. Background Photovoltaic brackets are an important component of solar power plants. The photovoltaic module supporting device has the function of supporting the photovoltaic module and guaranteeing the stable work of the module in the service period. The long-term exposure of photovoltaic stents to outdoor environments has faced a variety of challenges, all of which lead to rusting corrosion of the metal stents. In order to prevent corrosion, the current photovoltaic brackets mainly adopt a coating protection technology. The most common solution is a three-layer coating system. The first layer is an epoxy zinc rich primer that primarily provides adhesion and cathodic protection. The second layer is epoxy cloud iron intermediate paint, and mainly plays a role in barrier isolation. The third layer is fluorocarbon finish, which is mainly resistant to ultraviolet rays and chemical corrosion. The system is applied to the fields of building steel structures, bridges, chemical equipment and the like for decades, the technology is very mature, and the anti-corrosion effect is widely accepted. However, in practical application of the mature coating system in the photovoltaic bracket, the following problems still exist: (1) Corrosion cannot be found in time after it occurs. The photovoltaic power station has large area and a large number of supports, and a plurality of supports are installed in remote areas or on roofs. Once the coating is broken, the underlying metal begins to rust. But this early corrosion is not apparent. When rust spots can be seen by naked eyes, the metal is corroded for a period of time, and even the bracket needs to be replaced when serious. The detection method commonly used at present is manual inspection or periodic sampling, has low efficiency and high cost, and cannot perform real-time early warning. (2) The fluorocarbon finish paint is not wear-resistant in a sand wind environment. The fluorocarbon resin has good weather resistance, and is not pulverized and cracked for twenty years. However, the fluorocarbon coating has low hardness and poor wear resistance. In desert or Gobi area, the wind sand contains a large amount of quartz particles, and the wind sand is blown on the surface of the bracket at high speed, so that the finishing paint can be thinned or even worn out in a few years. Intermediate paints and primers also accelerate aging once the coating loses thickness protection. There are also some wear-resistant coatings on the market at present, but either the weather resistance is sacrificed or a large amount of hard filler is added to cause the coating to become brittle, so that it is difficult to simultaneously realize the wear resistance and the weather resistance. In view of the above, there is a lack of a coating solution in the prior art that can simultaneously achieve corrosion monitoring, high wear resistance and weather resistance. Disclosure of Invention The invention aims to provide an anti-corrosion fluorocarbon coating material, a preparation method and application thereof, solves the problems that the existing photovoltaic bracket coating cannot monitor corrosion state and fluorocarbon finish paint is easy to wear and lose efficacy in a sand-blown environment, and can effectively resist sand-blown corrosion. Based on the above objects, the present invention discloses a corrosion-resistant fluorocarbon coating material comprising: A first primer layer comprising an epoxy resin, a polyamide curing agent, a polyaniline/graphene composite, a flaky zinc powder, a KH-560 silane coupling agent and a solvent; the second intermediate paint comprises furan modified epoxy resin, bismaleimide, an anhydride curing agent, sn-Bi low-melting-point alloy micro powder, an ionic liquid repairing agent, a KH-550 silane coupling agent and a solvent; the third layer of finish paint comprises FEVE fluorocarbon resin, HDI trimer curing agent, silicon carbide whisker, hierarchical silicon dioxide microsphere, fluorosilane surface modifier and solvent; Wherein the mass ratio of the epoxy resin to the furan modified epoxy resin to the FEVE fluorocarbon resin is 1 (1.50-1.80) (0.80-1.00). Preferably, the components in the first layer of primer are used in the following amounts by taking epoxy resin as 100 parts by weight: 100 parts of epoxy resin, 32-38 parts of polyamide curing agent, 6-10 parts of polyaniline/graphene composite, 20-30 parts of flaky zinc powder, 2.5-4.0 parts of KH-560 silane coupling agent and 30-45 parts of solvent. Preferably, in the polyaniline/graphene composite, polyaniline is modified on the surface of graphene in a chemical grafting mode, and the mass ratio of graphene to polyan